We don’t need you any longer. Changing your interface or brand aren’t compelling reasons for us to use your services. They don’t solve a problem, so there’s no need to switch.
People may return to Flickr from Instagram, but that’s because of what Instagram (Facebook) does more than it is because of what Flickr does.
When Google Search screws up, maybe I’ll return to Yahoo.
When Gmail isn’t doing it for me, maybe I’ll return to Hotmail/Outlook.
Until then, what do I get for changing?